用“>”或“<”填空:若>1,则a_________1;若()m<(0.125)n,则m_________n;若1.7a<1.7b,则a_________b.
f(x)=x(x-c)2在x=2处有极大值,那么常数c的值是
若角的终边经过点,则的值为______________.
sin7°cos37°-sin83°cos53°值为___________.
计算 .